My kung fu brother Dave sent us this link of James DeMille (early Seattle student of Bruce Lee) playing around with a reaction timer to improve his striking reflex.
As we know, Bruce Lee was really into gadgets to improve his physical fitness and liked to make new tools with which to train. He was not only an innovator in the concept of mixing martial arts but was also a proto-biohacker.
Another of my kung fu brothers, Tyler, has suggested one of these might be made cheaply, using components. I will look into this and if it turns out to be possible, I will post our solution.
This is a scientific tool to do what I talked about in Triggers in Wing Chun.